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The MongoDB Asynchronous Driver

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/*
 * Copyright 2015 MongoDB, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.mongodb.async.client;

import com.mongodb.async.SingleResultCallback;

import java.util.concurrent.TimeUnit;

/**
 * Iterable for aggregate.
 *
 * @param  The type of the result.
 * @since 3.0
 */
public interface AggregateIterable extends MongoIterable {

    /**
     * Enables writing to temporary files. A null value indicates that it's unspecified.
     *
     * @param allowDiskUse true if writing to temporary files is enabled
     * @return this
     * @mongodb.driver.manual reference/command/aggregate/ Aggregation
     * @mongodb.server.release 2.6
     */
    AggregateIterable allowDiskUse(Boolean allowDiskUse);

    /**
     * Sets the maximum execution time on the server for this operation.
     *
     * @param maxTime  the max time
     * @param timeUnit the time unit, which may not be null
     * @return this
     * @mongodb.driver.manual reference/method/cursor.maxTimeMS/#cursor.maxTimeMS Max Time
     */
    AggregateIterable maxTime(long maxTime, TimeUnit timeUnit);

    /**
     * Sets whether the server should use a cursor to return results.
     *
     * @param useCursor whether the server should use a cursor to return results
     * @return this
     * @mongodb.driver.manual reference/command/aggregate/ Aggregation
     * @mongodb.server.release 2.6
     */
    AggregateIterable useCursor(Boolean useCursor);

    /**
     * Aggregates documents according to the specified aggregation pipeline, which must end with a $out stage.
     *
     * @param callback the callback, which is called when the aggregation completes
     * @mongodb.driver.manual aggregation/ Aggregation
     */
    void toCollection(SingleResultCallback callback);

    /**
     * Sets the number of documents to return per batch.
     *
     * @param batchSize the batch size
     * @return this
     * @mongodb.driver.manual reference/method/cursor.batchSize/#cursor.batchSize Batch Size
     */
    AggregateIterable batchSize(int batchSize);
}